Legal Incompetence & Judicial Evidence Restrictions

1. The Common Law Oath Doctrine as an Instrument of Disenfranchisement

In the early decades of the Swan River Colony, British colonial jurisprudence established an impenetrable evidentiary barrier against First Nations people through the common law oath doctrine.¹ Under English law, evidence in criminal trials could only be received upon an oath sworn on the Christian Bible by a witness who acknowledged a belief in divine retribution in the afterlife.² Because Bibbullmun witnesses maintained their own ancestral cosmologies and did not profess belief in the Christian God, colonial magistrates ruled them legally incompetent to take the oath, rendering their testimony inadmissible in court.³

2. Unilateral Immunity for Frontier Settler Violence

The practical consequence of this evidentiary exclusion was total legal immunity for British settlers committing violence against Indigenous people.⁴ If a white settler shot a Bibbullmun man, woman, or child in the bush, the only eyewitnesses were typically other Aboriginal clan members.⁵ Because those eyewitnesses could not be sworn, the Crown Prosecutor could not introduce their testimony, and magistrates were forced to dismiss charges for lack of admissible evidence.⁶ Conversely, white settlers could freely testify against Indigenous defendants, creating a completely asymmetrical judicial regime that criminalized Indigenous resistance while insulating colonial perpetrators.⁷

3. Statutory Reform Attempts: The 1841 and 1844 Evidence Acts

Recognising the grotesque injustice of this evidentiary vacuum, Governor John Hutt sought legislative remedy, introducing the Aboriginal Evidence Act 1841 (WA) to permit unsworn declarations in court.⁸ However, conservative settlers and pastoralists vehemently objected, and the British Colonial Office initially disallowed the legislation on technical grounds.⁹ When amended legislation was finally enacted in 1844, it included severe qualifying restrictions: an unsworn Aboriginal witness's testimony was deemed insufficient to support a conviction unless independently corroborated by white witnesses or physical circumstantial evidence.¹⁰

4. The Legacy of Structural Judicial Subjugation

The historical denial of evidentiary standing laid the foundation for institutional discrimination within the Western Australian criminal justice system.¹¹ By formalising the legal presumption that Indigenous testimony was inherently unreliable, colonial law constructed an apparatus of racialized policing and incarceration that persisted throughout the twentieth century and continues to reverberate in contemporary justice metrics.¹²